linux-kernel - Re: Hi, Ingo, would you please help drop the TSC MSR calibration patch

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Message-ID: <20160711083540.02f86b3f@icelake>
Date:	Mon, 11 Jul 2016 08:35:40 -0700
From:	Jacob Pan <jacob.jun.pan@...el.com>
To:	"Chen, Yu C" <yu.c.chen@...el.com>
Cc:	Ingo Molnar <mingo@...nel.org>, 'Len Brown' <lenb@...nel.org>,
	jacob.jun.pan@...el.com, Jacob Pan <jacob.jun.pan@...ux.intel.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Peter Zijlstra <peterz@...radead.org>,
	"x86@...nel.org" <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Hi, Ingo, would you please help drop the TSC MSR calibration
 patch

On Mon, 11 Jul 2016 07:59:19 -0700
"Chen, Yu C" <yu.c.chen@...el.com> wrote:

> Currently it is in your x86/timer tree:
> 
> commit fc273eeef314cdaf0ac992b400d126f8184a4d1c
> Author: Len Brown <len.brown@...el.com>
> Date:   Fri Jun 17 01:22:49 2016 -0400
> 
>     x86/tsc_msr: Extend to include Intel Core Architecture
> 
> 
> Previously we found this patch might decrease the performance on
> one of our servers, due to the small gap between using old PIT
> calibration and new MSR calibration method, so we currently would
> like to hold this patch for now, until we got a clear answer from our
> architect. Would you please help revert this patch (the other patches
> are safe and can be merged), sorry for the inconvenience.
> 
I modified the subject slightly to be more specific.
Adding lkml and x86 list, and a few more people.
This commit is also affected, won't compile if we revert the one above.

37c528e... x86/tsc_msr: Fix rdmsr(MSR_PLATFORM_INFO) unsafe warning in
KVM guest

> thanks,
> Yu
> 
> 

[Jacob Pan]